Method of gluing cardboard boxes and box adapted to be glued in accordance with suchmethod



May 2, 1967 K. R. PERSSON 3,317,116

METHOD OF GLUING CARDBOARD BOXES AND BOX ADAPTED TO BE GLUED IN ACCORDANCE WITH SUCH METHOD 5 Sheets-Sheet 1 Filed April 13, 1966 INVENTOR. KQRJ Rune Peasson BY w ,9

his m n y May 2, 1967 K. R. PERSSON 3,317,116

METHOD OF GLUING CARDBOARD BOXES AND BOX ADAPTED TO BE GLUED IN ACCORDANCE WITH SUCH METHOD Filed April 15, 1966 3 Sheets-Sheet 2 PEG 3 INVENTOR. Kmd Rune Peassan y 1967 K. R. PERSSON 3,317,116

METHOD OF GLUING CARDBOARD BOXES AND BOX ADAFTED TO BE GLUED IN ACCORDANCE WITH SUCH METHOD Filed April 13, 1966 3 Sheets-Sheet I5 INVENTOR Km Rune Peasson United States Patent Claims. (Cl. 229--38) This invention relates to a method of applying adhesive stripes to the closable end of a cardboard box of rectangular cross-section the four side walls of which have extensions at one end for forming a projecting frame which is adapted to be turned inwards about transverse fold lines at the end edges of said walls and which by fold lines is divided into portions corresponding to said end flaps and into intermediate portions forming hinged connections between the end flaps, wherein the width of the short end flaps located at the ends of the narrow walls is at most equal to half the width of the narrow walls, whereas one long end flap is wider than the other long end flap and of a width substantially equal to the width of the narrow walls, and wherein the corner portion between the respective end of the wide long flap and the adjacent short end flap is formed by two triangular portions located one on each side of the corner fold line of the frame, one of said two triangular portions being hingedly connected to the wide long flap along a 45 fold line and the other portion being hingedly connected to the short end flap along a 45 fold line.

The object of the invention is to render possible application of adhesive stripes in one and the same direction so that the box can pass through the adhesive applying device without the necessity of being stopped for apply ing transverse adhesive stripes. This object is attained by application of adhesive stripes in accordance with the method suggested by the invention. As a result it is possible during the subsequent upward turning of the wide long flap and its downward turning against the narrow long flap to guide the intermediate portions provided with adhesive stripes outwards and downwards onto the short flaps while those sides of the intermediate portions which during application of adhesive are facing upwards are turned downwards together with their longitudinal adhesive stripes and while these adhesive stripes at the same time are assuming transverse positions for sealing the end of the wide long flap with respect to the short flaps. Y

The invention also relates to a cardboard box suitable for carrying into effect the method of applying adhesive as well as a blank for erecting such box as will. appear from the appending claims.

The method according to the invention is described more closely with reference to an embodiment of a box according to the invention exemplified in the annexed drawings.

FIG. 1 illustrates the blank for erecting the box according to the invention, FIG. 2 illustrates an enlarged developed view of a portion of the closable end of the box, FIG. 3 illustrates a broken perspective view of the open end of the box with the end flaps in upright position, FIG. 4 illustrates an intermediate position during the closing operation in which position the adhesive stripes are appliedto the end flaps and their intermediate portions, FIGJS illustrates the end flaps in a subsequent position in which the wide long flap has been folded into upright position on its way down to the narrow long flap, and FIG. 6 is a perspective view of the closed end of the box.

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The blank according to FIG. 1 is substantially rectan gular and is subdivided by longitudinal fold lines 10a,

10b, 10c, 11a, 11b, 11c and transverse fold lines 12a,

12b, 13, 14, 15a, 15b into a bottom 16, two wide side walls 17, 18 and two narrow side walls 19. The wall 17 has extensions in the form of wing flaps 19a which together with the walls 19 form the narrow sides of the box. During erection of the box the walls 19 are glued to the wing flaps 19a which in the erected condition of the box are considered to be made in one piece and to coincide with the walls 19 for the purpose of simplifying the description of the invention.

Further, the wall 18 has an extension in the form of a long and wide end flap 21 of the same width as the narrow walls 19. The narrow walls 19 have extensions in the form of short end flaps 22 the width of which, i.e., the distance between the fold line 15b and the edge of the fiap 22, is somewhat smaller than half the width of the narrow walls.

The wide wall 17 has an extension in the form of a long and narrow end flap 23 which via wedge-shaped intermediate portions merges into end flaps 22a at the ends of the flaps 19a. The end flaps 22a are glued to the inside of the end flaps 22 and are considered hereinbelow to coincide with the end flaps 22 in the erected box according to FIG. 3. In FIGS. 2 and 3 the edge of the flaps 19a is indicated by a dotted line 24.

The wide long flap 21 extends between the fold lines 10c and 110. At its ends it is foldable relative to a greater triangular intermediate portion 25 located between the fold lines or and a 45 fold line 26.

Located on the other side of the fold line 100 is a smaller triangular intermediate portion 27 which along a 45 fold line 28 is hingedly connected with the short end flap 22 and has a straight free edge 29.

The short flap 22 extends between the fold line 28 and an oblique fold line 30 which forms a hinged connection with the above named wedge-shaped triangular portion 31 which on its other side is hingedly connected to the narrow long flap 23 along a fold line 32, as will be best seen from FIG. 2. The angle between the fold lines 30 and 32 is less than 45, and the free edge 31a of the portion 31 is aligned with the free edge 22a of the short flap 22. In the embodiment exemplified the free edge 22a is parallel to the edge fold line 15b.

As will be seen from the drawing, the narrow long flap 23 extends between the fold lines 32 and is somewhat wider than the short flaps 22. The free edge 23a of the flap 23 merges via a shoulder 33 into the free edge of the portion 31 so as to form a corner flap 33a for the purpose indicated below.

From the position shown in FIG. 3 the short flaps 22 are turned into the position shown in FIG. 4 and immediately thereafter the narrow long flap 23 is turned downwards onto the short flaps 22 and at the same time the wide long flap 21 is turned outwards and backwards so that all of the end flaps and intermediate portions are located substantially in a common plane as shown in FIG. 4.

In this position the erected box is moved in the longitudinal direction of the long flaps 21, 23 and is passed through an adhesive applying device, not shown, which applies two parallel adhesive stripes to the upwardly turned sides of the end flaps. These adhesive stripes are indicated in the drawings by thick, full lines. be seen from FIGS. 4 and 5, one adhesive stripe 34 is located on the narrow long flap 23 near the edge fold lines 12a thereof so as to form an attachment for the corresponding edge portion on the underside of the wide long flap 21. The other adhesive stripe is formed by two parts 35, 36 which are applied to the triangular intermediate portions 27 near the fold lines 100 and 110.

As will.

The adhesive employed may be of the kind that requires an immediate subsequent closure in which case the box shown in FIG. 4 as filled with its contents. Alternatively the end flaps may be turned upwards again to the position shown in FIG. 3 to enable filling of the box at a desired time. In that case the adhesive is preferably of the heat-sealing type which adheres upon heating. In both of said cases the end flaps are turned into the intermediate position shown in FIG. 5 where the wide long flap 21 is exactly upstanding and the narrow long flap 23 is turned downwards on the short flaps 22. In this position the intermediate portions 27 are extending obliquely upwardly. During downward turning of the wide long flap 21 against the narrow flap 23 the adhesive stripes 35 and 36 which now are located on the downwardly turned sides of the intermediate portions 27 will assume a transverse position relative to their longitudinal position according to FIG. 4. When the adhesive stripes 35, 36 come into contact with the short flaps 22 they assume the positions indicated by the parallel dot and dash lines 35a, 36a.

After the wide long flap 21 has been turned downwards against the underlying end flaps of the narrow walls and the narrow long flap it assumes the position shown in FIG. 6. From this figure as well as from FIG. 5 it will be clearly seen that the adhesive stripes 34, 3S and 36 form a frame which sealingly extends along the longitudinal and transverse edge portions of the wide long flap and, consequently, provides an effectively sealed closure.

During the downward turning of the wide long flap 21 the narrow long flap is locked to a certain degree due to the fact that the edge of the intermediate portion 27 lies upon the corner flap 33a of the narrow long flap 23 as will be seen from FIGS. 5 and 6.

Referring to FIG. 2 it should be pointed out that the free edge 29 of the intermediate portion 27 makes an acute angle with the edge fold lines 12a, 1512 which angle is approximately equal to the acute angle between the fold lines 32 and 12a. As a result thereof the free edge 29 of the intermediate portion 27 will lie outside the edge formed by the fold line 32 so that the intermediate portion 27 can be freely forced into contact with the short flap 22 in the region of the glue joints 35a and 36a.

What I claim is:

1. The method of applying adhesive stripes to the closable end of a cardboard box of rectangular cross-section the four side walls of which have extensions at one end for forming a projecting frame which is adapted to be turned inwards about transverse fold lines at the end edges of said walls and which by fold lines is divided into portions corresponding to said end flaps and into intermediate portions forming hinged connections between the end flaps, wherein the width of the short end flaps located at the ends of the narrow walls is at most equal to half the width of the narrow walls, whereas one long end flap is wider than the other long end flap and of a width substantially equal to the width of the narrow walls, and wherein the corner portion between the respective end of the wide long flap and the adjacent short end flap is formed by two triangular portions located one on each side of the corner fold line of the frame, one of said two triangular portions being hingedly connected to the wide long flap along a 45 fold line and the other portion being hingedly connected to the short end flap along a 45 fold line, characterized by turning the short end flaps inwards while turning the narrow long flap downward on said short end flaps and turning the wide long flap outwards such as to have all of the end flaps located substantially in a common plane, and moving the box in this position longitudinally relative to an adhesive applying device while applying two parallel adhesive stripes, one of which is applied to the narrow long flap along the longitudinal edge portion thereof, whereas the other stripe is applied to the triangular portions located between the short end flaps and the respective adjacent corner fold line of the frame.

2. The method as claimed in claim 1, characterized by turning the wide long flap into a position in contact with the adhesive stripe on the narrow long flap and simultaneously turning the triangular portions provided with adhesive stripes upwards and thereupon downwards against the short end flaps so as to press the adhesive stripes of the triangular portions against the underlying short end flaps.

3. The method as claimed in claim 2, characterized by applying the adhesive stripes in a manner such that they upon turning downwards of the wide long flap join each other and form a sealing frame.

4. A cardboard box comprising four interconnected side walls having extensions at one end for forming a rectangular projecting frame which is adapted to be turned inwards about transverse fold lines at the end edges of said walls and which by fold lines is divided into portions corresponding to said end flaps and into intermediate portions forming hinged connections between the end flaps, wherein the width of the short end flaps located at the ends of the narrow walls is at most equal to half the the width of the narrow walls, whereas one long end flap is wider than the other long end flap and of a width substantially equal to the width of the narrow walls, and wherein the corner portion between the respective end of the wide long flap and the adjacent short end flap is formed by two triangular portions located one on each side of the corner fold line of the frame, the greater one of said two triangular portions being hingedly connected to the wide long flap along a 45 fold line and the other, smaller portion being hingedly connected to the short end flap along a 45 fold line, characterized in that the width of the short end flaps is smaller than half the width of the narrow side walls, that the short end flap and the narrow long flap are hingedly connected to each other by a triangular intermediate portion the base of which is aligned with the free edge of the short end flap and the sides of which are defined by fold lines making an angle less than 45, and that the angle between the free edge of said smaller triangular intermediate portion and the end edge fold line of the adjacent narrow Wallis substantially equal to the angle between the fold line that forms the hinged connection between the wedge-shaped triangular intermediate portion and the narrow long flap and the end edge of the adjacent side wall such that the free edge of said smaller triangular intermediate portion is clear of the end edge of the narrow long flap during closure of the box.

5. A cardboard box as claimed in claim 4, characterized in that the narrow long flap is wider than the short end flaps, that the junction of the free edge of the narrow long flap with the free edge of the wedge-shaped triangular intermediate portion is formed by a shoulder that bounds a corner fi-ap of the narrow long flap, and that this corner flap is adapted to be pressed down against the adjacent short end flap of said smaller triangular intermediate portion when the wide long flap is turned down on the narrow long flap for gluing the end flaps together.

References Cited by the Examiner UNITED STATES PATENTS 2,799,442 7/1957 Van Rosen 22937 3,144,978 8/1964 Asman 229--37 3,229,890 1/1966 Wright 22937 JOSEPH R. LECLAIR, Primary Examiner.

D. M. BOCKENEK, Assistant Examiner. 

4. A CARDBOARD BOX COMPRISING FOUR INTERCONNECTED SIDE WALLS HAVING EXTENSIONS AT ONE END FOR FORMING A RECTANGULAR PROJECTING FRAME WHICH IS ADAPTED TO BE TURNED INWARDS ABOUT TRANSVERSE FOLD LINES AT THE END EDGES OF SAID WALLS AND WHICH BY FOLD LINES IS DIVIDED INTO PORTIONS CORRESPONDING TO SAID END FLAPS AND INTO INTERMEDIATE PORTIONS FORMING HINGED CONNECTIONS BETWEEN THE END FLAPS, WHEREIN THE WIDTH OF THE SHORT END FLAPS LOCATED AT THE ENDS OF THE NARROW WALLS IS AT MOST EQUAL TO HALF THE WIDTH OF THE NARROW WALLS, WHEREAS ONE LONG END FLAP IS WIDER THAN THE OTHER LONG END FLAP AND OF A WIDTH SUBSTANTIALLY EQUAL TO THE WIDTH OF THE NARROW WALLS, AND WHEREIN THE CORNER PORTION BETWEEN THE RESPECTIVE END OF THE WIDE LONG FLAP AND THE ADJACENT SHORT END FLAP IS FORMED BY TWO TRIANGULAR PORTIONS LOCATED ONE ON EACH SIDE OF THE CORNER FOLD LINE OF THE FRAME, THE GREATER ONE OF SAID TWO TRIANGULAR PORTIONS BEING HINGEDLY CONNECTED TO THE WIDE LONG FLAP ALONG A 45* FOLD LINE AND THE OTHER, SMALLER PORTION BEING HINGEDLY CONNECTED TO THE SHORT END FLAP ALONG A 45* FOLD LINE, CHARACTERIZED IN THAT THE WIDTH OF THE SHORT END FLAPS IS SMALLER THAN HALF THE WIDTH OF THE NARROW SIDE WALLS, THAT THE SHORT END FLAP AND THE NARROW LONG FLAP ARE HINGEDLY CONNECTED TOEACH OTHER BY A TRIANGULAR INTERMEDIATE PORTION THE BASE OF WHICH IS ALIGNED WITH THE FREE EDGE OF THE SHORT END FLAP AND THE SIDES OF WHICH ARE DEFINED BY FOLD LINES MAKING AN ANGLE LESS THAN 45*, AND THAT THE ANGLE BETWEEN THE FREE EDGE OF SAID SMALLER TRIANGULAR INTERMEDIATE PORTION AND THE END EDGE FOLD LINE OF THE ADJACENT NARROW WALL IS SUBSTANTIALLY EQUAL TO THE ANGLE BETWEEN THE FOLD LINE THAT FORMS THE HINGED CONNECTION BETWEEN THE WEDGE-SHAPED TRIANGULAR INTERMEDIATE PORTION AND THE NARROW LONG FLAP AND THE END EDGE OF THE ADJACENT SIDE WALL SUCH THAT THE FREE EDGE OF SAID SMALLER TRIANGULAR INTERMEDIATE PORTION IS CLEAR OF THE END EDGE OF THE NARROW LONG FLAP DURING CLOSURE OF THE BOX. 